P3805moderate severityPowertrain
48V Battery Temperature Sensor Circuit Malfunction
on 2018 Mazda Mazda3 2.5L I4 · FWD
What this code means
The 48V lithium-ion battery temperature sensor is reporting values outside the expected range.
Symptoms
- 48V system may be limited
- Charging/discharging restricted as precaution
- Inaccurate temperature reading
- Mild hybrid functions intermittent
- 48V battery warning
Common causes
- Temperature sensor failure
- Sensor wiring open or shorted
- Connector corrosion
- Sensor out of calibration
- Thermal paste degradation on sensor
Diagnostic steps
- Read 48V battery temperature PID
- Compare to infrared temperature measurement
- Test sensor resistance vs specification
- Inspect sensor connector
- Check wiring for damage
Repair notes
Replace 48V battery temperature sensor. Ensure proper thermal contact with battery cells.
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